sckemidt



3 Sheets-Sheet 1.

(No Model.)

F. E. SCHMIDT.

CUTTING ATTACHMENT FOR BUTTON HOLE SEWING MACHINES. No. 332,950.

Patent-ed Dec. 22, 1885.

WITNESSES N. PETER-S, mumm n her. Waahinghn. n. c.

Nd Model.) 3 sheetksneet 2.

F. E. SCHMIDT. CUTTING ATTACHMENT FDR BUTTON HOLE SEWING MACHINES.

Patented Dec. 22, 1885.

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(No Model.) 23' Sheets-Sheet 3.

F. E; SCHMIDT. v CUTTING ATTACHMENT FOR BUTTON HOLE SEWING MACHINES.

No. 332,950. Patented Dec. 22, 1-885.

W IVTNEE 5 E5 N. PETERS Phnxomhn m hm. \Vashingmn, D. c.

P I-Q7. FIG 0 3O jaw removed.

UNITED STATES PATENT OFF CE.

FRIEDRICH E. SCHMIDT, OF BROOKLYN, NEW YORK.

CUTTING ATTACHMENT FOR BUTTON-HOLE SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 332,950, dated December 22, 1885.

Application filed March 31, N85.

,To all whom it may concern:

Be it known that I, FRIEDRICH E. SCHMIDT, of the city of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Cutting Attachment for Button-Hole Sewing-Machines, of which the following specification is afull, clear, and exact description.

This invention relates to an improved cutting attachment for button-hole sewing-ma. chines. The object of the cutter is to punch the eye and cut the slit, which together go to make the complete button-hole. After the button-hole has been cut out it is finished by the needle in the usual way.

The invention consists, principally, in the combination of a cloth-clamp with a slide adapted to reciprocate within the cloth-clamp and carrying a punch, and with a plunger adapted to force down the punch.

The invention also consists in the elements of improvementhereinafter more fully pointed out.

In the accompanying sheets of drawings, Figure 1 is a side view of my improved cutting attachment. Fig. 2 is a front view of the machine-head, showing that part ofthe attachment which forces the punch down. Fig. 3 is a top view of the clothclamp with the upper Fig. 4 is a top view of such upper jaw. Fig. 5 is a partial top view of the cloth-clamp with parts broken away. Figs. 6, 7, and 8 are detail views of the punchoperating mechanism illustrated in Fig. 2. Fig. 9 is an elevation of the punch, and Fig. 10 a longitudinal section through its lower portion; Fig. 11, a side view of the punch. Fig. 12 is a longitudinal section through the work-plate, showing the knife; and Fig. 13 i a partial top view of the work-plate to show the feed-groove.

The sewingmachine has the customary head, A, above the work-plate B. This work-plate is provided with a feed-groove, a, Fig. 13, as usual to guide the cloth-clamp D. This clothclamp first travels toward the needle, then makes a half-turn, and then recedes from the needle to expose its shanks and eye to the needle. All this is of the construction Well known in this class of machines.

Serial No. 160,751. (No model.)

The cloth clamp D is composed of two upper jaws, b b, and two lower jaws, c 0, between which the cloth is held. The upper jaws are removed in Figs. 3 and 5, and are separately shown in Fig. 4.. These parts are also of the ordinary construction, and are illustratedonly for the sake of completeness.

To the cloth-clamp D is attached the punch,

and to the head A is attached the mechanism plug on this punch, entering the groove of 7c the tubular extension, serves to guide the punch. The punch F is provided with a head, g, upon which the mechanism bears which forces it down. Beneath the head engages a hook for drawing it up, all of which will .be later described.

h is a spring bearing against punch F, to hold it in position vertically by frictional contact. I prefer to provide the lower edge of punch F with a double-V-shaped cutting-edge, Figs. 9 and 10, so that in punching the hole the cutting-edge enters the cloth gradually. The punch is hollowed out at the bottom to receive a pin, t, which pushes out the small piece of cloth after it has been severed. This pin is forced down by a superposed coiled spring, and is prevented from falling out by means of a cross-pin sliding in a groove of lpin i, all as in Fig. 10. The lower arm of slide E is perforated, as at c, Fig. 1, to permit the passage of punch F. Thisarm slides in suitable ways formed in the cloth-clamp, and

serves to properly guide the slide E. When 7 I will now describe the mechanism attached to head A for forcing down and drawing up the punch. This mechanism is illustrated in Figs. 1, 2, 6, 7, and 8.

j is a casing open on top and bottom and attached to head A. In this casing slides a lun er K to which reci rocatin motion is b 7 7 imparted by hand-lever Z and intermediate link, m. The lower portion of easing j is slotted longitudinally, the slot being open at its lower end, and through this slot projects outward the front edge of the shank n of a hook, 0. The upper edge of this shank is beveled, and the roofp of the slot in casingj is correspondingly beveled, Figs. 6 and 8. The shank n is pivoted to plunger K, and a spring, g, has a tendency to force the hook o inwardto wit, beneath plunger K.

The operation of the parts as thus far described is as follows: After the slide E has been pushed forward and the punch F has arrived under the plunger the hand-lever Z is operated so as to cause the descent of plunger K. The plunger bearing upon the punch forces the same down through the cloth. During the descent of the plunger the hook 0 and its shank n of course also descend. After the plunger has descended so far that the uppermost portion of shank n has entered the slot of casingj the spring q is free to vibrate the shank n on its pivot, and the hook o is thus forced inward and beneath the head gof punch F. In this position the hook remains during the rest of the descent of plunger K. During the ascent of plunger K the hook 0 will draw the punch F up until the upper beveled edge of shank it strikes thebeveled roof p of slot in casing j. By means of this double bevel the shank n will be crowded back into casing the spring q will be compressed, the hook 0 will be swung outward, and the plunger will be released. The parts are now in position for the next descent of the plunger.

I willv now describe the mechanism for cutting out the slit. This mechanism is illustrated in Fig. 12. It consists of a blade, G, having a beveled back and attached to asuitable pivoted shank, 1'. s is a button secured to the shank, which is struck by the hand to vibrate the shank and force the blade up. The point of the blade enters the eye formed by the punch, and the blade then cuts out a long slit to complete the button-hole.

In order to limit the length of the slit, a

the cloth-clamp of a button-hole-sewing de-.

vice with a button-hole cutter mounted upon the said plate and moving therewith, as such 7 matter has been claimed in a previous application for a patent filed by me December 8, 1883, under Serial No. 113,918; but

I do claim 1. The combination of a cloth-clamp with a slide adapted to reciprocate within the clothclamp and carrying a punch, and with a plunger adapted to force down the punch, substantially as specified.

2. The combination of cloth-clamp D, having perforated slide E, with punch F, having head 9, and with head A, having a plunger for forcing down the punch and a hook for raising it, substantially as specified.

3. The combination of a cloth-clamp, D, with perforated slide E, having punch F, and with plunger K, the punch having a double- V-shaped cutting-edge, substantially as specified.

4. The combination of cloth-clamp D, having perforated slide E, with punch F, having recessed top, and with head A, casing j, plunger K, hook 0, and spring g, substantially as specified.

5. The combination of cloth-clamp D with perforated slide E, cutting-blade G, pivoted shank 1", button s, and stop t, and with an abutment for stop 15, substantially as specified.

6. The combination of clamp D and perforated slide E with punch F,for forming the eye of a button-hole, and operated by plunger K, and with blade G,for cutting the slit of a button-hole, and operated by shank r, substantially as specified.

FRIEDRICH E. SCHMIDT.

Witnesses:

F. v. BRIESEN, ROBT. ROY. 

